pi627mc-a4 AMI Semiconductor, Inc., pi627mc-a4 Datasheet - Page 3

• Manufacturer Part Number: pi627mc-a4
• Description: A Family Of 600dpi Cis Modules, Each With A Specific Led Light Source Semiconductor
• Manufacturer: AMI Semiconductor, Inc.

PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Functional Description
Each of the 3 modules consists of 27 PI3039 image sensors cascaded together. Each sensor consists of
192 photo-sensing elements (pixels), resulting in a module 5184 pixels long.
These image sensors have associated multiplex switches that are sequentially accessed with its digital shift
register. In addition, each has a chip-select switch that functions to activate its preceding sensor on the
cascaded sequence, after its predecessor chip has completed its scan. The start pulse initiates the shift
register of the first chip in all four sections. The first chip then sequentially clocks out the integrated image
charge from each pixel. These charges are passed through the sensors’ multiplexing switch and then out
onto the video line, where they are converted to a voltage. When the sensor completes its scan, the chip-
select switch on the following chip is switched on to continue the line scan until it completes its scan in one
section. A new scan is initiated when a start pulse is again entered into the first chip of each section.
The 27 sensors are cascaded together and bonded onto a PCB. The cascaded sensors are then divided
into 4 subsections, each subsection having its own output. The first 3 subsections contain 7 sensors and the
4
line capacitance, which are buffered by video amplifiers, to act as output drivers. The charge from each
output is integrated onto the video line capacitance and readout. Each pixel is then reset and ready to
integrate again.
Mounted in the module is a one-to-one graded indexed micro lens array that focuses the scanned
documents to be imaged onto its sensing plane.
Illumination is by means of an integrated LED light source. The particular Led for each module is listed in
Table 1
All components are housed in a small plastic housing which has a glass cover that acts as the focal point for
the object being scanned and protects the imaging array, micro lens assembly, and LED light source from
dust.
Figures 1 and 2 on page 4 show a block diagram and a cross section of a module.
th
contains 6 sensors. Each output is then connected to its own video line. The four video lines form a video
PI627MC-A4
PI628MC-A4
PI629MC-A4
Module
Table 1. Module vs LED Light Source
Page 3 of 13, Revised 2-23-04
660nm Red LED Bar
High power Yellow-Green LED Bar
Low power Yellow-Green LED Bar
LED Type